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Finding the Fourth Proportional to 21,811.55, 32,720.76 and 9,331.65

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Solution

The fourth proportional to 21,811.55, 32,720.76 and 9,331.65 is: 13,998.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.55 : 32,720.76 = 9,331.65 : x
  2. Step 2: Convert to fraction form
    21,811.55/32,720.76 = 9,331.65/x
  3. Step 3: Cross multiply
    21,811.55x = 32,720.76 × 9,331.65
  4. Step 4: Simplify right side
    21,811.55x = 305,338,680.05
  5. Step 5: Solve for x
    x = 305,338,680.05/21,811.55
  6. Step 6: Final answer
    x = 13,998.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.